<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
  <h2 :class="getClasses()">{{message}}</h2>
</div>

<script src="../js/vue.js"></script>
<script>
    const  app = new Vue({
      el:'#app',
      data:{
        message: '卢本伟牛逼！',
        active: 'aaa',
        line: 'bbb'
      },
      methods: {
        getClasses(){
          return [this.active,this.line]
        }
      }
    })
</script>
</body>
</html>